You can also place PDF files within an InDesign document.
I represent Recosoft the makers of PDF2ID. PDF2ID will convert a PDF to a full editable InDesign file. You get a Recosoft menu in InDesign (after installing the tool) then select the the command to Convert a PDF to InDesing. We have a trial version available from our web site. We also recommend you check out the web page http://www.recosoft.com/products/pdf2id/compare to get a full understanding about the different versions of PDF2ID. There is PDF2ID Lite for US$99.99 from Adobe Exchange then PDF2ID Standard for US$199 and PDF2ID Professional for US$299. The features vary and depending on your requirements the Adobe Exchange version may suffice.